CN107614964B - Light flux controlling member, light emitting device, and lighting device - Google Patents
Light flux controlling member, light emitting device, and lighting device Download PDFInfo
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- CN107614964B CN107614964B CN201680031027.4A CN201680031027A CN107614964B CN 107614964 B CN107614964 B CN 107614964B CN 201680031027 A CN201680031027 A CN 201680031027A CN 107614964 B CN107614964 B CN 107614964B
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- total reflection
- light
- reflection surface
- light emitting
- incident
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/20—Light sources comprising attachment means
- F21K9/23—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
- F21K9/232—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
- F21K9/69—Details of refractors forming part of the light source
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/04—Refractors for light sources of lens shape
- F21V5/043—Refractors for light sources of lens shape the lens having cylindrical faces, e.g. rod lenses, toric lenses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/04—Refractors for light sources of lens shape
- F21V5/045—Refractors for light sources of lens shape the lens having discontinuous faces, e.g. Fresnel lenses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/0091—Reflectors for light sources using total internal reflection
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
- G02B19/0009—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only
- G02B19/0014—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only at least one surface having optical power
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
- G02B19/0028—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed refractive and reflective surfaces, e.g. non-imaging catadioptric systems
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
- G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
- G02B19/0061—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
- F21K9/68—Details of reflectors forming part of the light source
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
- F21Y2103/30—Elongate light sources, e.g. fluorescent tubes curved
- F21Y2103/33—Elongate light sources, e.g. fluorescent tubes curved annular
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2105/00—Planar light sources
- F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
- F21Y2105/14—Planar light sources comprising a two-dimensional array of point-like light-generating elements characterised by the overall shape of the two-dimensional array
- F21Y2105/16—Planar light sources comprising a two-dimensional array of point-like light-generating elements characterised by the overall shape of the two-dimensional array square or rectangular, e.g. for light panels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
Abstract
The light flux controlling member (120) of the present invention includes: an incident region (121) that faces the light-emitting element (110); a first total reflection surface (122) disposed on the opposite side of the incident region; an emission surface (123) arranged in one direction orthogonal to the optical axis of the light-emitting element; a second total reflection surface (124) which is arranged on the opposite side of the light emission surface in one direction; a third total reflection surface (125) disposed on the opposite side of the second total reflection surface along the optical axis; and a connection surface (126) connecting the first total reflection surface and the third total reflection surface. Some of the light emitted from the light emitting element enters the incident region, is reflected by the first total reflection surface, and is emitted from the emission surface. The light emitted from the light emitting element is incident on the incident region, reflected by the second total reflection surface and the third total reflection surface in this order, emitted from the connection surface, re-incident on the first total reflection surface, and emitted from the emission surface.
Description
Technical Field
the present invention relates to a light flux controlling member that controls the distribution of light emitted from a light emitting element, and a light emitting device and an illumination device that include the light flux controlling member.
Background
In recent years, from the viewpoint of energy saving and environmental protection, lighting devices (for example, LED bulbs) using light emitting diodes (hereinafter also referred to as "LEDs") as light sources have been used as devices replacing incandescent lamps and fluorescent lamps. However, the conventional illumination device using the LED as a light source emits light only in the forward direction (the direction in which light from the light source is emitted), and cannot emit light in a wide range of directions as in an incandescent lamp or a fluorescent lamp. Therefore, the conventional lighting device cannot irradiate a wide range of light indoors by using reflected light from a ceiling or a wall surface, as in an incandescent lamp or a fluorescent lamp.
In order to make the light distribution characteristics of a conventional illumination device using an LED as a light source close to those of an incandescent lamp or a fluorescent lamp, it has been proposed to control the light distribution of light emitted from the LED by a light flux controlling member (see, for example, patent documents 1 and 2). Fig. 1 is a diagram showing the structure of a light flux controlling member described in patent documents 1 and 2. Fig. 1A is a perspective view of light flux controlling member 10 described in patent document 1, and fig. 1B is an optical path diagram of light flux controlling member 10 described in patent document 1. Fig. 1C is an optical path diagram of light flux controlling member 50 described in patent document 2.
As shown in fig. 1A and 1B, light flux controlling member 10 shown in patent document 1 includes bottom surface 20, first side surface 30, and second side surface 40. The bottom surface 20 includes a support surface 21 and an incident surface 22. The incident surface 22 includes a first incident surface 23, a second incident surface 24, and a third incident surface 25. The first side surface 30 includes a first convex surface 31 and a first reflective surface 32. The second side surface 40 includes a second convex surface 41 and a second reflective surface 42. In light flux controlling member 10 described in patent document 1, a part of light emitted from the light source enters first entrance surface 23 and exits from first convex surface 31. Further, a part of the light emitted from the light source enters the second incident surface 24, is reflected by the first reflecting surface 32, and is emitted from the second convex surface 41. Further, a part of the light emitted from the light source is incident on the third incident surface 25, reflected by the second reflecting surface 42 and the first reflecting surface 32, and emitted from the second convex surface 41.
As shown in fig. 1C, light flux controlling member 50 described in patent document 2 includes incident surface 60, convex surface 70, and total internal reflection surface 80. The incident surface 60 has a first incident surface 61 and a second incident surface 62. The convex surface 70 has a first convex surface 71 and a second convex surface 72. In light flux controlling member 50 described in patent document 2, a part of light emitted from the light source is incident on first incident surface 61 and is emitted from first convex surface 71. Further, some of the light emitted from the light source is incident on the second incident surface 62, is internally reflected by the total internal reflection surface 80, and is emitted from the second convex surface 72.
By controlling the traveling direction of the light emitted from the light source using light flux controlling members 10 and 50 in this way, it is possible to obtain light emitted not only in the forward direction but also in the lateral direction.
Documents of the prior art
Patent document
Patent document 1: U.S. patent application publication No. 2015/0043213 specification
Patent document 2: U.S. patent application publication No. 2014/0286018 specification
Disclosure of Invention
Problems to be solved by the invention
However, light flux controlling members 10 and 50 described in patent documents 1 and 2 have a problem that the uniformity of the light distribution characteristics is poor because there is less light directed rearward.
therefore, an object of the present invention is to provide a light flux controlling member capable of distributing light in all directions of the forward direction, the lateral direction, and the backward direction with good balance, such as a bulb or a fluorescent lamp. Another object of the present invention is to provide a light-emitting device and a lighting device including the light flux controlling member.
Means for solving the problems
A light flux controlling member according to the present invention controls light distribution of light emitted from a light emitting element, and includes: an incident region configured to be opposed to the light emitting element; a first total reflection surface arranged on the opposite side of the incident region; an emission surface arranged in one direction orthogonal to an optical axis of the light emitting element; a second total reflection surface arranged on the opposite side of the emission surface in the one direction; a third total reflection surface arranged on an opposite side of the second total reflection surface in a direction along the optical axis; and a connection surface connecting the first total reflection surface and the third total reflection surface, the incident region having: a first incident surface that is arranged to face the light emitting element and on which light of light emitted from the light emitting element, at least light having a small emission angle with respect to the optical axis, enters; and a second incident surface that is arranged closer to the second total reflection surface side than the first incident surface in the one direction, and on which light that travels toward the second total reflection surface side out of the light emitted from the light emitting element is incident, and that is reflected by the first total reflection surface and emitted from the emission surface after a part of the light emitted from the light emitting element is incident by the first incident surface, and that is another part of the light emitted from the light emitting element is incident by the second incident surface, reflected in this order by the second total reflection surface and the third total reflection surface, emitted from the connection surface, and re-incident by the first total reflection surface and emitted from the emission surface.
further, a light-emitting device of the present invention includes: a plurality of light emitting elements; and a light flux controlling member of the present invention, the light flux controlling member being disposed such that the incident region faces the plurality of light emitting elements.
Further, the lighting device of the present invention includes: a light-emitting device of the present invention; and a cover that diffuses and transmits outgoing light from the light emitting device.
Effects of the invention
according to the light flux controlling member of the present invention, the light distribution characteristics of the illumination device having the plurality of light emitting devices can be made close to those of an incandescent lamp or a fluorescent lamp.
Drawings
Fig. 1A to 1C are schematic diagrams showing the configurations of light flux controlling members described in patent documents 1 and 2.
Fig. 2A and 2B are diagrams illustrating an illumination device according to embodiment 1.
Fig. 3A to 3D are diagrams showing the configuration of a light flux controlling member according to embodiment 1.
Fig. 4 is an enlarged view of the region a shown in fig. 3C.
Fig. 5 is an optical path diagram of light emitted from the center of the light emitting element in the light flux controlling member of embodiment 1.
Fig. 6 is an optical path diagram of light emitted from the inner end of the light emitting element in the light flux controlling member of embodiment 1.
fig. 7 is an optical path diagram of light emitted from an outer end of a light emitting element in light flux controlling member according to embodiment 1.
Fig. 8 is a graph showing light distribution characteristics of the light emitting element, the light emitting device, and the illumination device.
Fig. 9A and 9B are views showing a lighting device according to embodiment 2.
fig. 10A and 10B are diagrams showing the structure of a light flux controlling member according to embodiment 2.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[ embodiment 1]
in embodiment 1, a description will be given of a lighting device that can be used in place of an incandescent lamp as a representative example of the lighting device of the present invention.
(Structure of Lighting device)
fig. 2 is a diagram showing a configuration of illumination device 100 according to embodiment 1 of the present invention. Fig. 2A is a sectional view of the illumination device 100, and fig. 2B is a view (plan view) for explaining the arrangement of the light-emitting element 110. The internal mechanism of the housing 150 is omitted in fig. 2A.
As shown in fig. 2A and 2B, illumination device 100 includes light-emitting device 130 including light-emitting element 110 and light flux controlling member 120, substrate 145, cover 147, and case 150.
The light emitting element 110 is a light source of the lighting device 100, and is mounted on the housing 150. The light emitting element 110 is a Light Emitting Diode (LED) such as a white light emitting diode. The number of the light emitting elements 110 is not particularly limited as long as it is two or more. In this embodiment, the number of the light emitting elements 110 is 22. The light emitting elements 110 are arranged at equal intervals in the circumferential direction. Light emitting element 110 is disposed such that optical axis OA thereof intersects light flux controlling member 120 (see fig. 4). Here, the "optical axis of the light emitting element" refers to a traveling direction of light emitted from the center of the light emitting surface of the light emitting element 110 and traveling in a direction along a normal line to the light emitting surface. Therefore, in the present embodiment, there are 22 optical axes OA of the light emitting elements 110. In the following description, the emission direction along the optical axis OA of the light emitted from the light emitting element 110 is referred to as the front, and the opposite direction is referred to as the rear.
Light flux controlling member 120 controls the distribution of light emitted from light emitting element 110. Light flux controlling member 120 is annular and is disposed in housing 150 so as to intersect optical axis OA of light emitting element 110. The shape of light flux controlling member 120 is rotationally symmetric with respect to rotation axis RA. The rotation axis RA is parallel to the optical axis OA of the light emitting element 110. One of the features of the present invention is the shape of beam control member 120, and therefore, the details of beam control member 120 will be described later.
Substrate 145 supports light emitting element 110 and light flux controlling member 120. The substrate 145 is disposed on the case 150 (the protruding portion 154). The substrate 145 is made of a metal having high thermal conductivity, such as aluminum or copper. When high thermal conductivity is not required for the substrate 145, a resin substrate obtained by impregnating a glass nonwoven fabric with an epoxy resin may be used as the substrate 145.
cover 147 covers light flux controlling member 120, and diffuses and transmits light emitted from light flux controlling member 120. The cover 147 has light transmittance. The cover 147 has a hollow region including an opening portion. The light emitting device 130 is disposed in the hollow region of the cover 147. The cover 147 is made of a transparent resin such as polymethyl methacrylate (PMMA), Polycarbonate (PC), or epoxy resin (EP), or glass. The cover 147 also has light diffusion properties. A method of imparting the light diffusion function to the cover 147 is not particularly limited. For example, the cover 147 may be formed by performing a light diffusion treatment (for example, roughening treatment) on the inner surface or the outer surface of the cover 147 formed of a transparent material, or by mixing a light-diffusing material containing a scattering material such as beads with the transparent material.
Cover 147 preferably has a shape rotationally symmetrical with respect to rotation axis RA of light flux controlling member 120. The shape of the cover 147 may be, for example, a shape composed only of a rotationally symmetrical shape, or a shape including a part of a rotationally symmetrical shape. Cover 147 is preferably shaped to further improve the uniformity of the light distribution of the light emitted from light flux controlling member 120. For example, from the viewpoint of further increasing the amount of light directed rearward, the shape of the cover 147 is preferably such that the diameter of the opening of the cover 147 is smaller than the maximum outer diameter of the cover 147. The shape of the cap 147 is, for example, a spherical cap shape (a shape in which a part of a spherical surface is cut off in a plane).
Case 150 supports substrate 145 on which light emitting element 110, light flux controlling member 120, and cover 147 are arranged at its front end portion. Housing 150 is substantially rotationally symmetric about rotation axis RA of light flux controlling member 120. The housing 150 has: a lamp cap 151; a tapered surface 152 disposed in front of the base 151 and gradually increasing in distance from the rotation axis RA toward the front; an annular end surface 153 formed by an annular flat surface perpendicular to the rotation axis RA and formed inward from the leading end edge of the tapered surface 152; and a cylindrical protrusion 154 protruding forward from the inner peripheral edge of the annular end surface 153.
The light emitting element 110 is attached to the circular distal end surface of the protrusion 154. The opening of the cover 147 abuts the annular end surface 153. The outer diameter of the annular end surface 153 is substantially the same as the outer diameter of the opening of the cover 147. The annular end surface 153 serves as a base against which the opening of the cover 147 abuts.
a power supply circuit for electrically connecting the base 151 and the light emitting element 110 is disposed inside a portion surrounded by the tapered surface 152 of the case 150. In addition, the case 150 also serves as a heat sink that discharges heat from the light emitting element 110. Therefore, the case 150 is preferably made of a metal having high thermal conductivity, such as aluminum or copper.
Light emitted from light emitting element 110 is controlled to be directed in all directions by light flux controlling member 120. The light emitted from light flux controlling member 120 is diffused and transmitted on cover 147.
(Structure of light flux controlling Member)
Here, the beam control unit 120 will be described in detail. Fig. 3A to 3D and fig. 4 show the structure of light flux controlling member 120. Fig. 3A is a top view and fig. 3B is a bottom view of light flux controlling member 120. Fig. 3C is a sectional view, and fig. 3D is a side view. Fig. 4 is an enlarged view of the region a shown in fig. 3C. In addition, hatching is omitted in fig. 4.
As shown in fig. 3A to 3D and 4, light flux controlling member 120 includes: incident area 121, first total reflection surface 122, exit surface 123, second total reflection surface 124, third total reflection surface 125, and connection surface 126. In the present embodiment, light flux controlling member 120 has leg portions 127 for fixing light flux controlling member 120 to substrate 145, while forming a gap for releasing heat emitted from light emitting element 110 to the outside. As described above, light flux controlling member 120 is annular and rotationally symmetric with respect to rotation axis RA. That is, the incident region 121, the first total reflection surface 122, the emission surface 123, the second total reflection surface 124, the third total reflection surface 125, and the connection surface 126 are annular rotationally symmetric surfaces, respectively. The rotation axis RA of light flux controlling member 120 is arranged along the optical axis OA of each light emitting element 110. More specifically, the rotation axis RA is an axis along the optical axis OA, which is disposed at a position closer to the second total reflection surface 124 and the third total reflection surface 125 side than the optical axis OA of each light emitting element 110 and further from the optical axis OA than the second total reflection surface 124 and the third total reflection surface 125.
The incident region 121 is disposed opposite to the light emitting element 110. Incident region 121 causes at least a part of the light emitted from light emitting element 110 to enter the inside of light flux controlling member 120. The shape of the incident area 121 is not particularly limited. The incident region 121 may be a plane, a curved surface, or a plurality of surfaces. In the present embodiment, the incident area 121 includes: a first incident surface 131 and a second incident surface 132 including a plurality of surfaces.
The first incident surface 131 is disposed opposite to the light emitting element 110. The shape of the first incident surface 131 is not particularly limited. The first incident surface 131 may be a flat surface, a curved surface, or a plurality of surfaces. In the present embodiment, the first incident surface 131 has a plurality of surfaces, and includes the first convex portion 133 and the second convex portion 134.
The first convex portion 133 is disposed between the optical axis OA of each light emitting element 110 and the emission surface 123. The first convex portion 133 causes a part of the light emitted from the light emitting element 110 and directed toward the light emitting surface 123 to enter and reflect toward the first total reflection surface 122. The first protrusion 133 includes an inner first inclined surface 135, an outer first inclined surface 136, and a first ridge 137. The inner first inclined surface 135 is disposed on the rotation axis RA side. On the other hand, the outer first inclined surface 136 is disposed at a position farther from the rotation axis RA than the inner first inclined surface 135. The inner first inclined surface 135 and the outer first inclined surface 136 may be one surface or may have a plurality of surfaces. In the present embodiment, the inner first inclined surface 135 and the outer first inclined surface 136 are one surface. A first ridge 137 is formed at the boundary between the inner first inclined surface 135 and the outer first inclined surface 136.
The inner first inclined surface 135 refracts a part of light emitted from the light emitting element 110 toward the outer first inclined surface 136. The shape of the inner first inclined surface 135 in the cross section including the rotation axis RA is not particularly limited. The shape of the inner first inclined surface 135 in the cross section including the rotation axis RA may be a straight line or a curved line. In the present embodiment, the shape of the inner first inclined surface 135 in the cross section including the rotation axis RA is a straight line. In the cross section including the rotation axis RA, the inclination angle of the inner first inclined surface 135 with respect to the rotation axis RA is not particularly limited as long as the above-described function can be exhibited. In the present embodiment, the inclination angle of the inner first inclined surface 135 with respect to the rotation axis RA is 0 °. That is, in the present embodiment, the inner first inclined surface 135 is arranged in a direction along the rotation axis RA (the optical axis OA of the light emitting element 110).
Outer first inclined surface 136 reflects the light incident from inner first inclined surface 135 toward first total reflection surface 122. The shape of the outer first inclined surface 136 in the cross section including the rotation axis RA is not particularly limited. The shape of the outer first inclined surface 136 in the cross section including the rotation axis RA may be a straight line or a curved line. In the present embodiment, the shape of the outer first inclined surface 136 in the cross section including the rotation axis RA is a straight line. In the cross section including the rotation axis RA, the inclination angle of the outer first inclined surface 136 with respect to the rotation axis RA (the angle formed by the outer first inclined surface 136 and a line passing through the end portion of the outer first inclined surface 136 on the light emitting element 110 side and parallel to the rotation axis RA) is not particularly limited as long as the above-described function can be exerted. In the present embodiment, the inclination angle of the outer first inclined surface 136 is 55 °. In the cross section including the rotation axis RA, the outer first inclined surface 136 is formed to be gradually distant from the rotation axis RA as being distant from the substrate 145.
The second convex portion 134 is disposed closer to the second incident surface 132 side (the rotation axis RA side) than the first convex portion 133 in one direction (more precisely, a direction orthogonal to the rotation axis RA) orthogonal to the optical axis OA of each light emitting element 110. The second convex portion 134 mainly causes a part of the light emitted from the end portion on the emission surface 123 side of the light emitting element 110 to enter, and reflects the light toward the first total reflection surface 122. The second projection 134 includes an outer second inclined surface 138, an inner second inclined surface 139, and a second ridge 140. The inner second inclined surface 139 is disposed on the rotation axis RA side. On the other hand, the outer second inclined surface 138 is disposed at a position farther from the rotation axis RA than the inner second inclined surface 139. The outer second inclined surface 138 and the inner second inclined surface 139 may be one surface or may have a plurality of surfaces. In the present embodiment, the outer second inclined surface 138 and the inner second inclined surface 139 are each a single surface. A second ridge 140 is formed at the boundary between the outer second inclined surface 138 and the inner second inclined surface 139.
The outer second inclined surface 138 refracts a part of the light emitted from the light emitting element 110 toward the inner second inclined surface 139. The shape of the outer second inclined surface 138 in the cross section including the rotation axis RA is not particularly limited. The shape of the outer second inclined surface 138 in the cross section including the rotation axis RA may be a straight line or a curved line. In the present embodiment, the shape of the outer second inclined surface 138 in the cross section including the rotation axis RA is a straight line. In the present embodiment, the inclination angle of the outer second inclined surface 138 with respect to the rotation axis RA is 0 °. That is, the outer second inclined surface 138 is arranged in a direction along the rotation axis RA (the optical axis OA of the light emitting element 110).
The inner second inclined surface 139 reflects the light incident from the outer second inclined surface 138 toward the first total reflection surface 122. The shape of the inner second inclined surface 139 in the cross section including the rotation axis RA is not particularly limited. The shape of the inner second inclined surface 139 in the cross section including the rotation axis RA may be a straight line or a curved line. In the present embodiment, the shape of the inner second inclined surface 139 in the cross section including the rotation axis RA is a straight line. In the cross section including the rotation axis RA, the inclination angle of the inner second inclined surface 139 with respect to the rotation axis RA (the angle formed by the inner second inclined surface 139 and a line passing through the end of the inner second inclined surface 139 on the light emitting element 110 side and parallel to the rotation axis RA) is not particularly limited as long as the above-described function can be exerted. In the present embodiment, the inclination angle of the inner second inclined surface 139 is 26.6 °. In the cross section including the rotation axis RA, the inner second inclined surface 139 is formed so as to gradually approach the rotation axis RA as being distant from the substrate 145. And (4) setting the parameters appropriately.
In a cross section including the rotation axis RA, the shape of the region between the first convex portion 133 and the second convex portion 134 may be a straight line or a curved line. In the present embodiment, the shape of the region is a straight line. More specifically, in the present embodiment, the region between the first convex portion 133 and the second convex portion 134 in the cross section including the rotation axis RA is shaped so as to gradually approach the rotation axis RA as being distant from the substrate 145.
In one direction (more precisely, a direction orthogonal to the rotation axis RA) orthogonal to the optical axis OA of each light emitting element 110, the second incident surface 132 is disposed at a position closer to the second total reflection surface 124 side (the rotation axis RA side) than the first incident surface 131. The second incident surface 132 receives light traveling toward the second total reflection surface 124 (toward the rotation axis RA) among the light emitted from the light emitting element 110. The shape of the second incident surface 132 is not particularly limited. In a cross section including the rotation axis RA, the shape of the second incident surface 132 may be a straight line or a curved line. In the present embodiment, the shape of the second incident surface 132 in the cross section including the rotation axis RA is a straight line. In addition, the inclination angle of the second incident surface 132 with respect to the rotation axis RA in the cross section including the rotation axis RA is not particularly limited. In the present embodiment, the second incident surface 132 in the cross section including the rotation axis RA is inclined at an angle of 0 ° with respect to the rotation axis RA. That is, in the cross section including the rotation axis RA, the second incident surface 132 is disposed along the rotation axis RA. In addition, in consideration of mold release at the time of injection molding, the second incident surface 132 may be inclined so as to gradually become distant from the rotation axis RA as it becomes distant from the substrate 145 in a cross section including the rotation axis RA.
First total reflection surface 122 is disposed on the opposite side of incident region 121. The first total reflection surface 122 totally reflects a part of the light incident from the incident region 121 in a direction away from the rotation axis RA toward the exit surface 123. In a cross section including the rotation axis RA, the first total reflection surface 122 is formed such that the slope of the tangent thereof becomes gradually smaller as it goes away from the rotation axis RA (as it goes closer to one direction).
the emission surface 123 is disposed in one direction (more precisely, a direction away from the rotation axis RA) orthogonal to the optical axis OA of the light emitting element 110 of each light emitting element 110. More specifically, emission surface 123 is disposed on the outermost side of light flux controlling member 120 as viewed from the direction of rotation axis RA. Output surface 123 emits light traveling inside light flux controlling member 120 to the outside. The emission surface 123 may be one surface or may include a plurality of surfaces. In the present embodiment, the emission surface 123 is formed of one surface. The shape of the exit surface 123 in the cross section including the rotation axis RA is not particularly limited. The shape of the emission surface 123 in the cross section including the rotation axis RA may be a straight line or a curved line. In the present embodiment, the shape of the emission surface 123 in the cross section including the rotation axis RA is a straight line. In the cross section including the rotation axis RA, the inclination angle of the emission surface 123 with respect to the rotation axis RA is not particularly limited. In the present embodiment, in the cross section including the rotation axis RA, the inclination angle of the emission surface 123 with respect to the rotation axis RA is 0 °. That is, the emission surface 123 is arranged in a direction along the rotation axis RA (the optical axis OA of the light emitting element 110).
The second total reflection surface 124 is disposed on the opposite side of the emission surface 123 in one direction (more precisely, a direction orthogonal to the rotation axis RA) orthogonal to the optical axis OA of each light emitting element 110. In other words, second total reflection surface 124 is disposed between rotation axis RA and emission surface 123. The second total reflection surface 124 may be one surface or may include a plurality of surfaces. In the present embodiment, the second total reflection surface 124 is one surface. The shape of the second total reflection surface 124 in a cross section including the rotation axis RA is not particularly limited. The shape of the second total reflection surface 124 in a cross section including the rotation axis RA may be a straight line or a curved line. In the present embodiment, the shape of second total reflection surface 124 in the cross section including rotation axis RA is a curve. In a cross section including the rotation axis RA, the second total reflection surface 124 is formed so as to gradually approach the substrate 145 as being distant from the rotation axis RA. In other words, the third total reflection surface 125 is formed to be gradually distant from the emission surface 123. In a cross section including the rotation axis RA, the second total reflection surface 124 is formed such that the slope of the tangent line thereof becomes gradually smaller (becomes approximately parallel to a line orthogonal to the rotation axis RA) as it goes away from the rotation axis RA.
Third total reflection surface 125 is disposed on the opposite side of second total reflection surface 124 in the direction along optical axis OA of each light emitting element 110. The third total reflection surface 125 may be one surface or may include a plurality of surfaces. In the present embodiment, the third total reflection surface 125 is one surface. The shape of the third total reflection surface 125 in a cross section including the rotation axis RA is not particularly limited. The shape of third total reflection surface 125 in a cross section including rotation axis RA may be a straight line or a curved line. In the present embodiment, the shape of third total reflection surface 125 in a cross section including rotation axis RA is a straight line. In a cross section including the rotation axis RA, the third total reflection surface 125 is formed to be gradually distant from the substrate 145 as being distant from the rotation axis RA. In other words, the third total reflection surface 125 is formed to be gradually distant from the emission surface 123 as approaching the second total reflection surface 124.
In the present embodiment, third total reflection surface 125 is connected to second total reflection surface 124. Further, in one direction (more precisely, a direction orthogonal to the rotation axis RA) orthogonal to the optical axis OA of each light emitting element 110, the third total reflection surface 125 partially overlaps the first total reflection surface 122. In a cross section including the optical axis OA, a connection surface 126 is disposed at a portion where the third total reflection surface 125 and the first total reflection surface 122 overlap when viewed along a direction orthogonal to the optical axis OA (rotation axis RA). In this way, since the end of third total reflection surface 125 that is farther from substrate 145 is disposed forward than the end of first total reflection surface 122 that is closer to substrate 145 in the direction along optical axis OA, light flux controlling member 120 can be reduced in size (thickness).
In a cross section including the rotation axis RA, from the viewpoint of appropriately reflecting light incident from the first incident surface 131 toward the exit surface 123 (reducing light transmitted through the first total reflection surface 122), the slope of a tangent line at an end of the third total reflection surface 125 distant from the substrate 145 is preferably smaller than the slope of a tangent line at an end of the first total reflection surface 122 near the substrate 145.
The connection surface 126 connects the first total reflection surface 122 and the third total reflection surface 125. The connecting surface 126 may be one surface or a plurality of surfaces. In the present embodiment, the connection surface 126 is one surface. The shape of the connection surface 126 in the cross section including the rotation axis RA is not particularly limited. The shape of the connection surface 126 in the cross section including the rotation axis RA may be a straight line or a curved line. In the present embodiment, the shape of the connection surface 126 in the cross section including the rotation axis RA is a straight line. In the cross section including the rotation axis RA, the inclination angle of the connection surface 126 with respect to the rotation axis RA is not particularly limited. In the present embodiment, the inclination angle of the connection surface 126 with respect to the rotation axis RA is 0 °. That is, in the present embodiment, the connection surface 126 is disposed in the direction along the rotation axis RA.
(light path of light in light flux controlling member)
Fig. 5 to 7 are partial enlarged optical path diagrams of the light emitting device 130. The light path in a section plane containing the axis of rotation RA is shown in these figures. Fig. 5 is an optical path diagram of light emitted from the center of the light emitting element 110. Fig. 6 is an optical path diagram of light emitted from the inner end of the light emitting element 110. Fig. 7 is an optical path diagram of light emitted from the outer end of the light emitting element 110. In fig. 5 to 7, hatching of light flux controlling member 120 is omitted to show the optical path.
As shown in fig. 5, of the light emitted from the center of the light emitting element 110, the light having a small emission angle with respect to the optical axis OA of the light emitting element 110 enters the region between the first convex portion 133 and the second convex portion 134, is reflected by the first total reflection surface 122, and is emitted from the emission surface 123. At this time, most of the light emitted from the emission surface 123 is emitted rearward. Among the light emitted from the center of the light emitting element 110, the light having a large emission angle with respect to the optical axis OA of the light emitting element 110 and emitted toward the second incident surface 132 (toward the rotation axis RA) is incident on the second incident surface 132, reflected by the second total reflection surface 124 and the third total reflection surface 125 in this order, emitted from the connection surface 126, incident again on the first total reflection surface 122, and emitted from the emission surface 123. Among the light emitted from the center of the light emitting element 110, the light emitted toward (outside) the first convex portion 133 with a large emission angle with respect to the optical axis OA of the light emitting element 110 is incident on the inner first inclined surface 135, reflected by the outer first inclined surface 136, internally reflected again by the first total reflection surface 122, and emitted from the emission surface 123.
As shown in fig. 6, of the light emitted from the end portion on the rotation axis RA side of the light emitting element 110, the light having a large emission angle with respect to the optical axis OA of the light emitting element 110 and emitted toward the second incident surface 132 side (rotation axis RA side) is incident on the second incident surface 132, reflected in the order of the second total reflection surface 124 and the third total reflection surface 125, emitted from the connection surface 126, incident again on the first total reflection surface 122, and emitted from the emission surface 123. On the other hand, of the light emitted from the end portion on the rotation axis RA side of the light emitting element 110, the light having a large emission angle with respect to the optical axis OA of the light emitting element 110 and emitted toward (outside) the first convex portion 133 is incident on the first incident surface 131, reflected by the first total reflection surface 122, and then emitted from the emission surface 123. At this time, most of the light emitted from the emission surface 123 is emitted rearward.
In this way, first total reflection surface 122, second total reflection surface 124, and third total reflection surface 125 are designed to facilitate total reflection of light emitted from light emitting element 110 on the side closer to second incident surface 132 than optical axis OA after entering light flux controlling member 120. As a result, as shown in fig. 7, some of the light emitted from the outer end of light emitting element 110 enters first incident surface 131 or second incident surface 132, reaches first total reflection surface 122, second total reflection surface 124, and third total reflection surface 125 through various paths, and is not totally reflected and emitted. At this time, most of the emitted light is emitted in a direction away from the rotation axis RA.
As shown in fig. 5 to 7, some of the light emitted from light emitting element 110, traveling inside light flux controlling member 120, and emitted from emission surface 123 is emitted laterally (outward) from emission surface 123. Part of the light emitted from the light emitting element 110 is also emitted from a portion other than the emission surface 123. Specifically, some of the light emitted from the light emitting element 110 is also emitted from the first total reflection surface 122, the second total reflection surface 124, and the third total reflection surface 125. Although light emitted from light emitting element 110 is also emitted from second total reflection surface 124, it is not shown in fig. 5 to 7.
(light distribution characteristics of light emitting device and Lighting device)
Next, in order to confirm the effect of light flux controlling member 120 of the present embodiment, the light distribution characteristics of light emitting device 130 including 22 light emitting elements 110 and light flux controlling member 120 and the light distribution characteristics of illumination device 100 in which cover 147 is attached to light emitting device 130 were simulated. Specifically, the relative illuminance in all directions in a plane including the rotation axis RA is obtained with the intersection point of the rotation axis RA and a virtual plane including the light-emitting surfaces of the 22 light-emitting elements 110 as a reference point. In this simulation, the illuminance on a virtual plane at a distance of 1000mm from the reference point was calculated. For comparison, light distribution characteristics when only 22 light emitting elements 110 were used were also simulated.
Fig. 8 is a graph showing light distribution characteristics of light emitting element 110, light emitting device 130, and illumination device 100. The numerical value shown on the outer side of the graph indicates an angle (°) with respect to the reference point. 0 ° represents the direction of the optical axis OA (forward direction), 90 ° represents the horizontal direction (lateral direction), and 180 ° represents the backward direction. In addition, the numerical values shown on the inner side of the graph indicate relative illuminance (maximum value 1) in each direction. The dotted line in the graph indicates the result when only light-emitting element 110 is used, the alternate long and short dash line indicates the result when light-emitting element 110 and light flux controlling member 120 are combined (light-emitting device 130), and the solid line indicates the result when light-emitting element 110, light flux controlling member 120, and cover 147 are combined (illumination device 100).
as shown in fig. 8, it is understood that the light emitting device 130 (dashed dotted line) appropriately generates light in the direction of ± 120 ° in addition to light in the forward direction. This is considered to be because light emitted from light emitting element 110 toward rotation axis RA (reference point) can be appropriately controlled in the backward direction by second total reflection surface 124 and third total reflection surface 125 of light flux controlling member 120. Thus, it is understood that the light emitting device 130 can reduce the unevenness of light by equalizing the amounts of emitted light in the forward direction, the lateral direction, and the rearward direction. In addition, it is understood that the illumination device 100 in which the cover 147 is attached to the light-emitting device 130 can further reduce the unevenness of light by equalizing the amounts of emitted light in the forward direction, the lateral direction, and the rearward direction.
(Effect)
As described above, illumination device 100 including light flux controlling member 120 according to the present embodiment includes second total reflection surface 124 and third total reflection surface 125 for controlling light emitted from light emitting element 110 toward rotation axis RA of light flux controlling member 120, and therefore light emitted from light emitting element 110 toward rotation axis RA of light flux controlling member 120 can be controlled to appropriately travel rearward. The illumination device 100 of the present embodiment can exhibit light distribution characteristics closer to those of an incandescent lamp than conventional illumination devices.
[ embodiment 2]
Next, the lighting device 200 of embodiment 2 will be described. In embodiment 2, a description will be given of a lighting device that can be used in place of a fluorescent lamp as a representative example of the lighting device of the present invention.
(Structure of Lighting device)
Fig. 9 is a diagram showing a configuration of an illumination device 200 according to embodiment 2 of the present invention. Fig. 9A is a sectional view of the lighting device 200, and fig. 9B is a view (plan view) for explaining the arrangement of the light emitting element 110. Fig. 10 is a diagram showing a structure of light flux controlling member 220 according to embodiment 2. Fig. 10A is a perspective view of light flux controlling member 220 viewed from cover 247 side, and fig. 10B is a perspective view of light flux controlling member 220 viewed from substrate 245 side.
As shown in fig. 9A and 9B, the lighting device 200 includes: two light emitting devices 230, a base plate 245, and a cover 247. The two light emitting devices 230 respectively include: a plurality of light emitting elements 110, a light flux controlling member 220, and a leg portion 227.
The light emitting element 110 is the same as the light emitting element 110 used in the illumination device 100 of embodiment 1. In each light emitting device 230, the plurality of light emitting elements 110 are arranged in a row on the substrate 245. The number of the light emitting elements 110 in one light emitting device 230 is not particularly limited as long as two or more light emitting elements are provided. In this embodiment mode, the number of the light emitting elements 110 is 11. Light flux controlling member 220 is formed in a columnar shape. Two light emitting devices 230 are disposed on substrate 245 such that second total reflection surfaces 224 of light flux controlling member 220 face each other and third total reflection surfaces 225 face each other. Light flux controlling section 220 will be described later.
Cover 247 diffuses and transmits light emitted from light flux controlling member 220 to the outside. The cover 247 is disposed with respect to the light emitting devices 230 with an air layer therebetween so as to cover all of the light emitting devices 230. The outer surface of the cap 247 is an effective light emitting area. The shape of the cover 247 is not particularly limited as long as the light-emitting device 230 can be covered with an air layer. In the example shown in fig. 9A, the cap 247 has a shape in which a part of a cylinder is cut off, but the cap 247 may have a cylindrical shape or the like.
As shown in fig. 10A and 10B, light flux controlling member 220 of embodiment 2 is formed in a columnar shape. Light flux controlling member 220 has: the light source device includes an incident region 221, a first total reflection surface 222, an exit surface 223, a second total reflection surface 224, a third total reflection surface 225, and a connection surface 226. The incident region 221, the first total reflection surface 222, the emission surface 223, the second total reflection surface 224, the third total reflection surface 225, and the connection surface 226 extend in a direction (arrangement direction of the plurality of light emitting elements 110) orthogonal to a direction along the optical axis OA of each light emitting element 110 and one direction orthogonal to the optical axis OA (more precisely, a direction connecting the emission surface 223, the second total reflection surface 224, and the third total reflection surface 225). Therefore, each surface has no curvature in this direction (the arrangement direction of the plurality of light emitting elements 110).
The incident region 221 is disposed opposite to the light emitting element 110. The incident region 221 includes a first incident surface 231 and a second incident surface 232. The first incident surface 231 has: a first convex portion 233 including an inner first inclined surface 235, an outer first inclined surface 236, and a first ridge 237; and a second protrusion 234 including an outer second inclined surface 238, an inner second inclined surface 239, and a second ridge 240.
The shape of the cross section in the short axis direction of incident region 221, first total reflection surface 222, emission surface 223, second total reflection surface 224, third total reflection surface 225, and connection surface 226 is the same as the shape of the side of light flux controlling member 120 including the cross section of rotation axis RA in embodiment 1. Further, the functions of incident region 221, first total reflection surface 222, emission surface 223, second total reflection surface 224, third total reflection surface 225, and connection surface 226 are the same as those of incident region 121, first total reflection surface 122, emission surface 123, second total reflection surface 124, third total reflection surface 125, and connection surface 126 of light flux controlling member 120 in embodiment 1, respectively.
(Effect)
As described above, light flux controlling member 220 of embodiment 2 has the same effects as light flux controlling member 120 of embodiment 1. The illumination device 200 of the present embodiment can exhibit light distribution characteristics closer to those of a fluorescent lamp than conventional illumination devices.
The present application claims priority based on japanese patent application No. 2015-113054, filed on 3/6/2015. The contents described in the specification and drawings are all incorporated in the specification of the present application.
Industrial applicability
the lighting device of the present invention can be used in place of an incandescent lamp or a fluorescent lamp, and therefore can be widely applied to various lighting devices such as a ceiling lamp, a fluorescent lamp, and an indirect lighting device.
Description of the reference numerals
10. 50 light beam control member
20 bottom surface
21 bearing surface
22. 60 incident surface
23. 61 first incident surface
24. 62 second plane of incidence
25 third incident surface
30 first side of
31 first convex surface
32 first reflecting surface
40 second side
41 second convex surface
42 second reflecting surface
70 convex surface
71 first convex surface
72 second convex surface
80 total internal reflection surface
100. 200 lighting device
110 light emitting element
120. 220 light beam control component
121. 221 incident region
122. 222 first total reflection surface
123. 223 emergent surface
124. 224 second total reflection surface
125. 225 third total reflection surface
126. 226 connecting surface
127. 227 feet part
130. 230 light emitting device
131. 231 first incident surface
132. 232 second incident plane
133. 233 first projection
134. 234 second projection
135. 235 first inclined surface at inner side
136. 236 outer first inclined plane
137. 237 first ridge
138. 238 second inclined surface on outer side
139. 239 inner second inclined plane
140. 240 second ridge
145. 245 base plate
147. 247 cover
150 casing
151 lamp holder
152 conical surface
153 annular end face
154 projection
OA optical axis
RA rotating shaft
Claims (9)
1. A light flux controlling member that controls distribution of light emitted from a light emitting element, comprising:
An incident region configured to be opposed to the light emitting element;
A first total reflection surface arranged on the opposite side of the incident region;
An emission surface arranged in one direction orthogonal to an optical axis of the light emitting element;
A second total reflection surface arranged on the opposite side of the emission surface in the one direction;
A third total reflection surface arranged on an opposite side of the second total reflection surface in a direction along the optical axis; and
A connection surface connecting the first total reflection surface and the third total reflection surface,
The incident region has:
A first incident surface that is arranged to face the light emitting element and on which light of light emitted from the light emitting element, at least light having a small emission angle with respect to the optical axis, enters; and
A second incident surface that is arranged closer to the second total reflection surface side than the first incident surface in the one direction and on which light traveling toward the second total reflection surface side out of light emitted from the light emitting element enters,
A part of the light emitted from the light emitting element is incident on the first incident surface, reflected by the first total reflection surface, and emitted from the emission surface,
The light emitted from the light emitting element is incident on the second incident surface, reflected by the second total reflection surface and the third total reflection surface in this order, emitted from the connection surface, and re-incident on the first total reflection surface and emitted from the emission surface.
2. The light beam steering section of claim 1,
The second incident surface is arranged along the optical axis.
3. The light beam control section according to claim 1 or 2,
The first incident surface includes:
a first convex portion arranged between the optical axis and the emission surface, and configured to cause a part of light emitted from the light emitting element and directed to the emission surface side to enter and then be reflected by the first total reflection surface;
And a second convex portion which is arranged closer to the second incident surface side than the first convex portion in the one direction, and which mainly causes a part of light emitted from an end portion of the light emitting element on the second total reflection surface side to be incident and then reflected toward the first total reflection surface.
4. The light beam steering section of claim 1,
The first total reflection surface is formed such that a slope of a tangent line becomes gradually smaller toward the one direction,
The second total reflection surface is formed to gradually get away from the exit surface as approaching the third total reflection surface,
The third total reflection surface is formed to gradually get away from the exit surface as approaching the second total reflection surface.
5. The light beam steering section of claim 1,
The connection surface and the emission surface are arranged in a direction along the optical axis.
6. The light beam steering section of claim 1,
the incident area, the first total reflection surface, the exit surface, the second total reflection surface, the third total reflection surface, and the connection surface are rotationally symmetric about an axis as a rotation axis, the axis being closer to the second total reflection surface and the third total reflection surface with respect to the optical axis, the axis being disposed farther from the optical axis than the second total reflection surface and the third total reflection surface.
7. The light beam steering section of claim 1,
The incident area, the first total reflection surface, the exit surface, the second total reflection surface, the third total reflection surface, and the connection surface extend in a direction orthogonal to the optical axis and the one direction.
8. A light emitting device comprising:
A plurality of light emitting elements; and
The light beam control section of any one of claims 1 to 7,
The light flux controlling member is disposed so that the incident region faces the plurality of light emitting elements.
9. An illumination device, comprising:
The light-emitting device of claim 8; and
And a cover which diffuses and transmits light emitted from the light emitting device.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015-113054 | 2015-06-03 | ||
| JP2015113054A JP6507035B2 (en) | 2015-06-03 | 2015-06-03 | Light flux control member, light emitting device and lighting device |
| PCT/JP2016/066217 WO2016194959A1 (en) | 2015-06-03 | 2016-06-01 | Luminous flux control member, light-emission device, and illumination device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107614964A CN107614964A (en) | 2018-01-19 |
| CN107614964B true CN107614964B (en) | 2019-12-10 |
Family
ID=57440225
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201680031027.4A Expired - Fee Related CN107614964B (en) | 2015-06-03 | 2016-06-01 | Light flux controlling member, light emitting device, and lighting device |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US10480721B2 (en) |
| JP (1) | JP6507035B2 (en) |
| CN (1) | CN107614964B (en) |
| WO (1) | WO2016194959A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018125245A (en) * | 2017-02-03 | 2018-08-09 | 株式会社エンプラス | Surface light source device and display device |
| WO2018196562A1 (en) * | 2017-04-26 | 2018-11-01 | 苏州欧普照明有限公司 | Lens and illuminating device using same |
| CN112130702A (en) * | 2019-06-25 | 2020-12-25 | 英属开曼群岛商音飞光电科技股份有限公司 | Thin proximity sensing device |
| US10976023B1 (en) * | 2020-02-10 | 2021-04-13 | Ideal Industries Lighting Llc | Luminaires and components thereof |
| CA3147174A1 (en) * | 2019-09-03 | 2021-03-11 | Jin Hong Lim | Luminaires and components thereof |
| US11174999B2 (en) * | 2020-02-10 | 2021-11-16 | Ideal Industries Lighting Llc | Luminaires and components thereof |
| US11655962B1 (en) * | 2022-03-25 | 2023-05-23 | Dialight Corporation | Lens to produce high angle off-axis light with narrow beam width |
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| CN103206665B (en) | 2012-01-11 | 2017-07-28 | 欧司朗股份有限公司 | Lens and the lighting device with the lens |
| JP6294635B2 (en) * | 2013-11-08 | 2018-03-14 | 株式会社エンプラス | Surface light source device and display device |
| KR102174249B1 (en) * | 2014-01-17 | 2020-11-04 | 엘지이노텍 주식회사 | Material for controlling luminous flux, light emitting device and display device |
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| CN107518702B (en) * | 2016-06-22 | 2024-04-05 | 赛尔富电子有限公司 | LED bar lamp and exhibition cabinet |
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-
2016
- 2016-06-01 WO PCT/JP2016/066217 patent/WO2016194959A1/en active Application Filing
- 2016-06-01 CN CN201680031027.4A patent/CN107614964B/en not_active Expired - Fee Related
- 2016-06-01 US US15/579,259 patent/US10480721B2/en not_active Expired - Fee Related
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| JP2009244316A (en) * | 2008-03-28 | 2009-10-22 | Stanley Electric Co Ltd | Light guide lens |
| CN102207277A (en) * | 2010-03-30 | 2011-10-05 | 恩普乐股份有限公司 | Light flux controlling member, light emitting device and lighting device |
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Also Published As
| Publication number | Publication date |
|---|---|
| US20180156393A1 (en) | 2018-06-07 |
| JP6507035B2 (en) | 2019-04-24 |
| WO2016194959A1 (en) | 2016-12-08 |
| CN107614964A (en) | 2018-01-19 |
| JP2016224366A (en) | 2016-12-28 |
| US10480721B2 (en) | 2019-11-19 |
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